Evidence of topological edge states in a superconducting nonsymmorphic nodal-line semimetal

doi:arXiv:2105.03285

	Evidence of topological edge states in a superconducting nonsymmorphic nodal-line semimetal
	Xu, L.X.1,2,3 ; Xia, Y.Y.Y.1,4 ; Liu, S.1,3,5 ; Li, Y.W.1 ; Wang, H.Y.1 ; Wang, C.W.1,2,3 ; Yang, H.F.1 ; Liang, A.J.1 ; Huang, K.1 ; Deng, T.1,2,3; Xia, W.1,4 ; Zhang, X.1 ; Zheng, H.J.1 ; Chen, Y.J.6; Yang, L.X.6; Wang, M.X.1 ; Guo, Y.F.1,4 ; Li, G.1,4 ; Liu, Z.K.1,4 ; Chen, Y.L.1,4,6,7 ; L. Chen, Y.
	2021-05-10
状态	已发表
摘要	Topological materials host fascinating low dimensional gapless states at the boundary. As a prominent example, helical topological edge states (TESs) of two-dimensional topological insulators (2DTIs) and their stacked three-dimensional (3D) equivalent, weak topological insulators (WTIs), have sparked research enthusiasm due to their potential application in the next generation of electronics/spintronics with low dissipation. Here, we propose layered superconducting material CaSn as a WTI with nontrivial Z2 as well as nodal line semimetal protected by crystalline non-symmorphic symmetry. Our systematic angle-resolved photoemission spectroscopy (ARPES) investigation on the electronic structure exhibits excellent agreement with the calculation. Furthermore, scanning tunnelling microscopy/spectroscopy (STM/STS) at the surface step edge shows signatures of the expected TES. These integrated evidences from ARPES, STM/STS measurement and corresponding ab initio calculation strongly support the existence of TES in the non-symmorphic nodal line semimetal CaSn, which may become a versatile material platform to realize multiple exotic electronic states as well as topological superconductivity.
DOI	arXiv:2105.03285
相关网址	查看原文
出处	Arxiv
WOS记录号	PPRN:11758859
WOS类目	Physics, Condensed Matter
资助项目	National Key R&D program of China[
文献类型	预印本
条目标识符	https://kms.shanghaitech.edu.cn/handle/2MSLDSTB/348225
专题	物质科学与技术学院_公共科研平台_拓扑物理实验室物质科学与技术学院_PI研究组_柳仲楷组物质科学与技术学院_PI研究组_郭艳峰组物质科学与技术学院_PI研究组_李刚组物质科学与技术学院_PI研究组_于奕组物质科学与技术学院_特聘教授组_陈宇林生命科学与技术学院_硕士生物质科学与技术学院_博士生生命科学与技术学院_本科生大科学中心_公共科研平台_大科学装置建设部
作者单位	1.Shanghai Tech Univ, Shanghai Sci Res Ctr, Sch Phys Sci & Technol, CAS, Shanghai 200031, Peoples R China 2.Shanghai Inst Microsyst & Informat Technol, Chinese Acad Sci, State Key Lab Funct Mat Informat, Shanghai 200050, Peoples R China 3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 4.Shanghai Tech Lab Topol Phys, Shanghai 201210, Peoples R China 5.Shanghai Inst Opt & Fine Mech, Chinese Acad Sci, Shanghai 201800, Peoples R China 6.Tsinghua Univ, Dept Phys, State Key Lab Low Dimens Quantum Phys, Beijing 100084, Peoples R China 7.Univ Oxford, Dept Phys, Oxford, England
推荐引用方式 GB/T 7714	Xu, L.X.,Xia, Y.Y.Y.,Liu, S.,et al. Evidence of topological edge states in a superconducting nonsymmorphic nodal-line semimetal. 2021.